What is water of crystallisation ? Write the common name and chemical formula of a commercially important compound which has ten water molecules as water crystallisation. How is this compound obtained ? Write the chemical equation also. List any two uses of this compound.

What is water of crystallisation ? Write the common name and chemical

1.	What is water of crystallisation ? Write the common name and chemical formula of a commercially important compound which has ten water molecules as water crystallisation. How is this compound obtained ? Write the chemical equation also. List any two uses of this compound.
Answer» SOLUTION :Water of crystallisation is the fixed number of water molecules present in one formula unit of the compound. The compound having ten water molecules as water of crystallisation in `Na_2CO_3.10H_2O` Its name is washing soda. Washing soda is obtained by heating BAKING soda and recrystallising the sodium carbonate obtained. `2NaHCO_(3) overset("Heat") rarr Na_2CO_3 + H_2O + CO_2` `Na_2CO_3 + 10 H_2O rarr Na_2CO_310 H_2O` Uses of wahing soda : (i) It is used in removing permanent hardness of water. (II) It is used in the manufacture of GLASS, soap and paper.